AOE Seminar: Energy-Based Characterization - A New Method for Characterizing Composite Materials and Structures| Speaker | Dr. Tomonari Furukawa |
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| Institution | Institute for Advanced Learning and Research |
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| Faculty Host | Dr. Rakesh Kapania |
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| Date & Time | 08.31.2009 04:00pm |
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| Location | 129 McBryde Hall |
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The talk will present the energy-based characterization, a new theoretical and experimental framework for characterizing composite materials and structures, which the speaker has been developing over ten years. The energy-based characterization evaluates material behavior on a continuum basis by measuring the external work applied on the surface of a specimen and the internal energy induced within the specimen and inversely solves for a constitutive model by applying the principle of minimum total potential energy. This allows the characterization of complex multi-axial material behavior even from one specimen unlike conventional techniques, which characterize material behavior in only one axis for each material test. Both explicit and implicit constitutive modelings have been enabled within the framework so that the material behavior can be characterized in both physics-driven and data-driven manners. Stochastic modeling has also been formulated by applying Kalman filter with the assumption of Gaussian uncertainties in addition to the deterministic modeling. The extensive formulations quantify the reliability of the characterized constitutive model at every deformation. If multi-axial testing machines are employed, the maximization of the reliability allows the loading path of material test to be optimally designed; offline by simulating external work and internal energy through finite element analysis and online by measuring them through experiments. The performance of the energy-based characterization has been numerically and experimentally validated and compared to the conventional characterization, and the preliminary investigations have demonstrated that it improves material characterization by two orders in efficiency. Having been developed under the support of Office of Naval Research, the energy-based characterization is currently being implemented to drive a material testing machine with six degrees of freedom developed at Naval Research Laboratory. The talk will also cover recent challenge of the energy-based characterization to structural health monitoring and other major ongoing research projects including analysis, design and control of MAVs and UAVs to explore the future collaboration with faculty in Aerospace and Ocean Engineering Department. |
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